Very often when talking about the energy retrofit of a building the main solution considered it is a simple external insulation.
There are some other options available, such as the double skin facades. This technology allows to give a new architectural outlook to the building.
At the same time the summer overheating can be reduced thanks to the ventilation behind the outer layer of the double skin facade.
In one of the BuildTog++ projects the double skin facade it’s also used for seismic purposes.